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| 防瓦斯 | |||
| 气体保护 | |||
| 煤气防护; 瓦斯保护; 毒气防护; 防化; 防毒 | |||
| gas protection: 15 phrases in 5 subjects |
| Aviation | 1 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 6 |
| Technology | 5 |
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